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+// Exa 7.1
+clc;
+clear;
+close;
+//given data
+f=200;// in Hz
+// Let us take
+C=0.1;// in micro F
+C=C*10^-6;// in F
+R=1/(2*%pi*f*C*sqrt(6));// in ohm
+R=R*10^-3;// in k ohm
+// R1>=10*R, Let
+R1=10*R;// in kohm
+R_f= 29*R1;// in k ohm
+R_f=R_f*10^-3; // in M ohm
+R_f=ceil(R_f);
+disp(R_f,"Resistor of phase-shift oscillator in Mohm")
+
+
+